CN101625475A - Composite optical film and manufacturing method thereof - Google Patents

Abstract

The invention discloses a composite optical film with high luminance, high diffusance and no interference of Newton rings, which comprises a base material layer, a diffusion layer and a light condensing layer stacked in sequence, wherein the diffusion layer comprises a diffusion layer resin which comprises a plurality of particles, is adjacent to a particle swarm of the base material layer and fixes the particle swarm; the light condensing layer comprises a light condensing layer resin, forms a light outlet surface and a microstructure unit capable of collectively emitting light rays; and the microstructure unit comprises a plurality of main microstructures regularly arranged. The composite optical film is characterized in that: a joint surface for joining the diffusion layer with the light condensing layer is formed to trend to the particle swarm periphery; the diffusion layer is provided with a plurality of bulges covering at least one particle respectively; and the microstructure unit also comprises a plurality of secondary microstructures which cover at least one bulge respectively, trend to extend between two adjacent main microstructures, and/or extend the covered main microstructures. The composite optical films have consistent efficacy performance between different optics under the circumstance of mass manufacture of production lines.

Description

Complex optical film and its manufacture method

Technical field

The present invention relates to a kind of blooming, particularly relate to a kind of being applicable to and be installed in LCD (liquid crystal display, LCD) complex optical film in.The present invention is also relevant for the manufacture method of this complex optical film.

Background technology

For allowing the screen of LCD exhale the light of high brightness equably, the blooming of multiple different kenels is developed in this area; The function and the structure of diffusion barrier, condensing film are combined into one, and have saved the complex optical film [composite opticalfilm, or be called " multifunctional membrane " (multi-functi onal film)] of base material consumption, especially a newer research and development trend.Similarly, high briliancy and high diffusibleness also are the effect requirement of this area for complex optical film.

Complex optical film can be divided into two kinds of different classifications haply according to its structure kenel, a kind of aspect wherein is for example Japanese patent laid-open 9-304607, TaiWan, China M306662, TaiWan, China M327035, disclose with USP 2007/0121227 A1 case, this type of complex optical film includes two-layer body: a substrate layer, and with a diffusion light collecting layer that is arranged on this substrate layer.Wherein, this diffusion light collecting layer be include resin be subjected to this resin fix and in order to the diffusion light most particle; In addition, the exiting surface of this diffusion light collecting layer is to be rule or irregular concavo-convex continuously, so light is assembled whereby.Briefly, complex optical film is because of the existence of these particles and the geometrical configuration of its exiting surface, and makes it can present the diffusion and the congregational rate of light synchronously.

Yet these particles are to be dispersed at random and widely in this diffusion light collecting layer everywhere, and particularly when this diffusion exiting surface of light collecting layer and the distance between this substrate layer during obviously greater than the particle diameter of described particle, even if each complex optical film obtains in that identical process conditions is following, also can differ because of the light scattering effect that population caused of each blooming, and have different mist degrees to show, so will badly influence the product yield of making in the downstream, thus this type of complex optical film not suitable amount produce and make.

Other has the complex optical film of a class, its diffusion layer and light collecting layer then are indivedual settings, but not belong to one deck body, disclose as TaiWan, China 200815789 cases, the structure of its complex optical film 1 as shown in Figure 1, and to state clearly the particle ranges of indices of refraction be 1.65～2.5, and the particle refractive index is greater than the light collecting layer refractive index.

These particles 111 are to be distributed in dispersedly in this diffusion layer 11, the light that enters this diffusion layer 11 except meeting because of shooting these particles 111 and be reflected and spreading, the light that enters smoothly on the other hand in these particles 111 can be in wearing when penetrating these particles 111 by its circular-arc surface and the refractive index difference of 12 of these particles 111 and light collecting layers, and by optically focused, institute is so that this diffusion layer 11 has diffusion and spotlight effect (referring to the 7th page of second and third section of this case instructions) simultaneously; In addition 12 of its light collecting layers utilize its etc. microstructure 121 the surface geometry configuration and the light that enters in it is able to by optically focused once more.So this complex optical film 1 except having basic diffusion effect, also is considered to have preferable spotlight effect with the setting of light collecting layer 12 based on its diffusion layer 11.

Right this case applicant thinks, if all light is after first time optically focused, these microstructures 121 of all also need passing through again just can pass the exiting surface 122 of this light collecting layer 12, and obviously all light are the relatively long paths of passing through, and its homenergic certainly will also progressively be consumed in traveling process.

In addition, various complex optical film is when light passes, and there is the rainbow line in its surperficial regular meeting, thereby has reduced LCD user's vision satisfaction; It is reported that this rainbow line phenomenon is because due to the geometrical configuration and arrangement mode of the regularization of these microstructures of light collecting layer.

Based on the above shortcoming, what more need on the market is that a kind of diffusibleness, briliancy performance are all good, and can not present the complex optical film of rainbow line, and a kind of these complex optical films of preparing, and can make the effect consistance that has height between each blooming again, and be fit to carry out the complex optics membrane preparation method of volume production.

Summary of the invention

Though this light collecting layer 12 can be assembled the light that penetrates this diffusion layer 11 and promote briliancy in TaiWan, China 200815789 cases; Solution strategy with respect to TaiWan, China 200815789 cases, the applicant is anti-, and it is genuinely thought if wherein there is the light of part promptly directly to pass this exiting surface (just only carrying out a time optically focused) after passing particle, can be because of its short consume that reduce luminous energy in path of passing through.Therefore, the objective of the invention is a kind of above-mentioned market demand and high complex optical film of quality consistency of meeting is being provided.First purpose of the present invention is promptly providing a kind of complex optical film.Referring to Fig. 2～4, complex optical film 2 of the present invention comprises a substrate layer 3, a diffusion layer 4 that piles up in regular turn, with a light collecting layer 5, this diffusion layer 4 includes one and comprises most particle 411,411 ' and abut population 41 in this substrate layer 3, and one fixes the diffusion layer resin 412 of this population 41; 5 of this light collecting layers include a light collecting layer resin 51, and are formed with an exiting surface 52 and its geometrical configuration and can make light 6,6 ' assemble the microstructure unit 53 that ground penetrates, and this microstructure unit 53 also includes most main microstructures 531; It is characterized in that: it is to take advantage of a situation to form in the periphery of this population 41 that this diffusion layer 4 is connected in the interface 42 of this light collecting layer 5, and this diffusion layer 4 also has most the lug bosses 43 that coat at least one particles 411 or 411 ' out of the ordinary; 53 of this microstructure units also include most at least one lug bosses 43 of coating out of the ordinary and take advantage of a situation and protrude out between the two adjacent main microstructures 531, and/or protrude out the inferior microstructure 532,532 ' of a main microstructure 531 that is held; These particles 411,411 ' refractive index are then between 1.2～1.6 and less than the refractive index of light collecting layer 5.

It is to carry out optically focused and pass this exiting surface 52 second time through this main microstructure 531 that the light 6 that enters these particles 411 has higher chance, and it is only promptly directly to pass this exiting surface 52 behind an optically focused of this particle 411 ' that the light 6 ' that enters these particles 411 ' has higher chance; And this time microstructure 532 is to mean the structure that protrudes out between the two adjacent main microstructures 531, and inferior microstructure 532 ' then is to mean the structure that protrudes out a main microstructure 531 that is held.

Because of the position that is provided with of this population 41 is to be restricted to contiguous this substrate layer 3, make that the different population in each complex optical film of the present invention can present consistent light diffusion effect.Moreover the light 6 ' of injecting the particle 411 ' in this grade microstructure 532,532 ' almost is not pass through unnecessary path just directly through this exiting surface 52 of optically focused ground ejaculation on particle 411 ' arcuation surface after passing these particles 411 '; The light 6 of injecting other particle 411 then be when ejecting particle 411 behind first time optically focused, carry out this exiting surface 52 of optically focused ground ejaculation second time through these main microstructures 531 again.

Therefore, beneficial effect of the present invention is: this blooming can have the performance of more excellent briliancy, and the effect of each complex optical film of producing of same batch is also more consistent, helps a large amount of productions.The applicant is also through experiment confirm, and these technical characterictics make the briliancy performance of complex optical film of the present invention be better than the complex optical film that its structure such as TaiWan, China 200815789 cases are disclosed really.

This grade microstructure 532,532 ' existence are to make complex optical film of the present invention have one of reason of excellent effect, and be single with regard to configuration aspects, and the preparation method's of complex optical film of the present invention key promptly is this grade microstructure 532,532 ' formation.The applicant thinks, at this diffusion layer 4 and light collecting layer 5 is to be provided with in order down, if the shape of the end face (this interface 42 just) of this diffusion layer 4 is to take advantage of a situation in the periphery of this population 41 these lug bosses 43 that respectively are coated with at least one particle 411 or 411 ' to be formed, also be used light collecting layer resin in addition with specific shrinkage factor, then when this light collecting layer 5 be in one solidify that plastotype handles stage to be formed the time, can be because of the shrinkability of this light collecting layer resin 51, and make some lug boss 43 only be coated slightly, and form the inferior microstructure 532 that convexedly stretches between the two main microstructures 531, and/or convexedly stretch in the inferior microstructure 532 ' in the main microstructure 531 that is held.

So, second purpose of the present invention, promptly providing a kind of preparation method of complex optical film of the present invention, comprise: with the particle of particle size range between 0.1 μ m～100 μ m, and its solid content is the diffusion layer resin solution between 20wt%～80wt%, between 0.1～6, mix with the weight ratio of resin at particle, then coat on this substrate layer with a wet-film thickness between 4 μ m～50 μ m and make its dry sclerosis, and formation has these lug bosses and its roughness is the diffusion layer of this interface between between 1 μ m～8.0 μ m, then be to coat on this interface the back between the light collecting layer resin solution between 90wt%～100wt% with a wet-film thickness between between 3 μ m～40 μ m to accept one and solidify plastotype and handle with a solid content, to obtain this light collecting layer; This light collecting layer resin is the shrinkage factor that has between 1%～10%.

In addition, " solid content " mean in the specific resin solution, the shared percentage by weight of all component summations beyond the solvent.

Description of drawings

Fig. 1 is a cut-open view, and the aspect of the complex optical film that TaiWan, China 200815789 is disclosed is described;

Fig. 2 is a cut-open view, and the position corresponding relation of each member in complex optical film first preferred embodiment of the present invention is described;

Fig. 3 is a synoptic diagram, and two kinds of routes of passing through when light passes complex optical film of the present invention are described;

Fig. 4 is a schematic perspective view, and the position corresponding relation between each member in the present invention's first preferred embodiment is described;

Fig. 5～7 are cut-open views, illustrate that respectively the geometry kenel of the main microstructure in the complex optical film of the present invention changes;

Fig. 8 is a cut-open view, and the position corresponding relation of each member in the present invention's second preferred embodiment is described;

Fig. 9 is a cut-open view, and the position corresponding relation of each member in the comparative example 2,4 is described.

Embodiment

Basic structure important document with regard to above-described complex optical film of the present invention, enumerate several forms that can be changed again now and be aided with graphic (each member to scale draw) illustrating, the operating conditions of the effect that can promote complex optical film of the present invention is offered suggestions think reference simultaneously.And select for use relevant for each species material, and the suggestion of the physicochemical property relevant with its material, hold the back narration.

Consult Fig. 2,3, the structure kenel of complex optical film first preferred embodiment of the present invention and the relativeness between each layer body are basically as previously mentioned.

The interface 42 of this diffusion layer 4 is to take advantage of a situation in the periphery of this population 41 and form, and because of this population 41 be to abut in this substrate layer 3, so will help to make this complex optical film 2, each complex optical film 2 that reaches same batch of manufacturing presents preferable and consistent efficacy performance, promotes follow-up LCD product yield and be of value to; Whether each particle piles up, and the distance between two adjacent particles 411,411 ', and employed diffusion layer resin solution is relevant with the materials ratio during all with its formation, but does not influence enforcement of the present invention.

For avoiding light 6, the 6 ' path of passing through in this diffusion layer 4 long, preferably the average thickness of this diffusion layer 4 is between 1 μ m～40 μ m; More preferably be between 10 μ m～30 μ m; More preferably be again between 20 μ m～30 μ m.The thickness of this substrate layer 3 then advises it being between 38 μ m～300 μ m, more preferably is between 38 μ m～250 μ m; More preferably be again between 50 μ m～250 μ m.The material that the personage that these substrate layer 3 spendable materials can be any the technical field of the invention has known is listed such as but not limited to the 8th page of the 11st～20 row of TaiWan, China 200815789 instructionss.

Advise that this population 41 should all have the particle 411,411 ' of large and small size; The less particle of size helps to make light to spread equably, size the greater then helps to make light to enter wherein and is assembled then, consider that again these lug bosses 43 can be formed smoothly, preferably, these particles 411,411 ' particle diameter are to be distributed between 0.1 μ m～100 μ m.Other advises that these particles 411,411 ' mean grain size are between 5 μ m～40 μ m, is preferably between 5 μ m～30 μ m, and more preferably be to be distributed between 10 μ m～30 μ m.

Referring to Fig. 2,4, most main microstructures 531 in the present invention's first preferred embodiment complex optical film 2, its outward appearance kenel be prismatic shape and in twos in abutting connection with and arrange continuously.So in the present invention, the outward appearance kenel of these main microstructures 531 there is no particular restriction, and the arrangement of being continuous as long as have spotlight effect with can being rule or scrambling; Except the prismatic shape shown in first preferred embodiment, these main microstructures 531 also can for example be conical, pyramid or the like (can be with reference to TaiWan, China 200815789 Fig. 5,6 institutes list), like crooked prismatic shape of extending [can be with reference to TaiWan, China I274896 Fig. 5 wavily, 7～9 list], perhaps as this case Fig. 5 list by having most identical or different secondary microstructures 533,533 ', perhaps the cross section at its top is roughly to be circular-arc (so its top itself is roughly to be ball arcuation or semi arch column) as illustrated in fig. 6, and perhaps its top cross-section is to be flat condition various main microstructures 531 such as (so its top are to be the butt shape) itself as illustrated in fig. 7.

Referring to Fig. 5～7, the average height 536 of the horizontal mean distance 534 of two adjacent main microstructures 531, the width 535 of each main microstructure 531, these main microstructures 531 (meaning the mean value of the vertical range difference of each tops of these main microstructures 531 and this interface 42) does not have special restriction yet in this case, right horizontal mean distance 534 with width 535 when big, height 536 hour, then help this grade microstructure 532,532 ' formation.Basically the preferably horizontal mean distance 534 of suggestion be between between 10 μ m～300 μ m, average height 536 be between between 10 μ m～100 μ m, width 535 is between 8 μ m～200 μ m; More preferably horizontal mean distance 534 be between between 20 μ m～250 μ m, average height 536 be between between 15m～60 μ m, width 535 is between 25 μ m～150 μ m; More preferably horizontal again mean distance 534 be between between 40 μ m～120 μ m, average height 536 be between between 15 μ m～40 μ m, width 535 is between 25 μ m～90 μ m.

Referring to Fig. 8, the structure kenel of complex optical film second preferred embodiment of the present invention and this first preferred embodiment are similar, different places is to be that this complex optical film 2 also includes one and is in reverse to these diffusion layer 4 ground and is arranged at wall 7 on this substrate layer 3, it contains most particle 71 and the resin 72 of fixing these particles 71, and forms space 73 by these particles 71.

This wall 7 is used in the art at large, it is that the resin solution that will be dispersed with particle in (can select for use and treat polymerization single polymerization monomer by this resin, or through the polymer substance of polymerization), coat the surface that is away from this diffusion layer 4 of this substrate layer 3 and form after drying, these wall 7 usefulness so that affiliated complex optical film and with its diaphragm of folding mutually between do not stick together mutually because of there being space 73.In the present invention for the size of this wall 7, use material, preparation method etc. to there is no particular restriction, generally the wall of being implemented in this area all is applicable to the present invention; This wall 7 even can be the aspect of the diffusion layer 4 shown in Fig. 8 so can make blooming of the present invention that higher haze value is arranged.

And the preparation method of the invention described above complex optical film proposed by the invention, its basic important document and design be before purpose has been set forth in, below puts up with other further operating conditions and furnish an explanation and advise.

Referring to Fig. 2, the population 41 of the complex optical film of making for making of the present invention abuts in this substrate layer 3, basically the particle 411,411 ' of density greater than this diffusion layer resin solution used in suggestion, perhaps use the lower diffusion layer resin solution of solid content, can sedimentation when this diffusion layer resin is still uncured in order to these particles 411,411 '.

For the formation of sharp these lug bosses 43 and to make the interface 42 of this diffusion layer 4 have due roughness (preferably be between 1.5 μ m～6 μ m, more preferably be between 2 μ m～6 μ m, so that this diffusion layer 4 has better diffusion effect and presents higher diffusibleness, and help this grade microstructure 532,532 ' formation), the inventive method is removed above-mentioned relevant for this diffusion layer 4 various resin solution solid contents in the preparation, the weight ratio of particle and resin, wet-film thickness, beyond the basic restriction such as particle size range, this diffusion layer resin solution solid content is preferably between 30%～75%, more preferably is between 50%～75%; The weight ratio of particle and diffusion layer resin between 0.5～5 more preferably is between 0.5～4; This wet-film thickness is preferably between 10 μ m～40 μ m, more preferably is between 30m～40 μ m.In addition, the inventive method is then before described together for the suggested range of particle diameter.

This diffusion layer resin solution is coated on this substrate layer 2 and when dry gradually, this interface 42 also will the periphery of this population 41 according to gesture gradually and form.And, can make 2 haze values that obtain relatively of blooming of the present invention fall within scope between 2%～95% according to the different preparation conditions of this diffusion layer 4; This haze value is to measure when only being provided with this diffusion layer and substrate layer.

Wear ejaculation for make light as far as possible, various material used in the present invention all is advisable with transparent person, and except need make the particle refractive index between between 1.2～1.6 and the refractive index that is not more than light collecting layer resin, particle be the shrinkage factor of refractive index, light collecting layer resin less than the light collecting layer resin between basic qualification the such as between 1%～10%, be not restricted to use particular types; Further, the refractive index of diffusion layer resin is similar to the refractive index of particle, and is good with the refractive index with particle, continues to enter diffusion layer in order to the light of injecting particle.

General solvent in this area in order to dissolving resin, basically in the present invention all can be as the solvent of this diffusion layer resin solution and light collecting layer resin solution, for example methyl alcohol (being called for short MeOH), ethanol (being called for short EtOH), isopropyl alcohol (being called for short IPA), butanone (being called for short MEK), toluene (being called for short TOL), dimethylbenzene (being called for short XYL), butyl acetate (being called for short BAC), glycol ether (BCS), water wherein preferably are IPA, MEK, TOL, XYL, BAC, BCS.The present invention also allows above-mentioned solvent of dissolving each other is used.

These particles 411,411 ' restriction especially of shape, but the particle of shapes such as deflection sphere, elliposoidal is used in suggestion basically, after forming, when passing these particles 411 ', can be assembled light 6 ' by its arcuation surface in this grade microstructure 532.

In addition for promoting spotlight effect, preferably these particles 411,411 ' refractive index are between 1.3～1.6, more preferably are between 1.4～1.6; In addition preferably, these particles 411,411 ' and this light collecting layer resin refractive index difference be in 0.5, be preferably again in 0.4, more preferably be in 0.2.

Consider again for these particles 411,411 ' the dispersiveness in this diffusion layer resin solution, and the engineering properties of complex optical film of the present invention, optical appearance or the like, the diffusion layer resin that uses of suggestion is an acryl resin (Acrylic Resins) for example, polyamide (Polyamides Resins), epoxy resin (Epoxy Resins), fluoroplast (Fluoropolymer Resins), polyimide resin (PolyimideResins), polyurethane resin (Polyurethane Resins), alkyd resin (Alkyd Resins), vibrin (Polyester Resins) or the like treat polymerization single polymerization monomer, or, also allow various transparent resin mixed and use with as this diffusion layer resin through the polymer substance of polymerization.And the material of these particles is preferably selected from acryl resin (Acrylic Resins), styrene resin (Styrene Resins), amido formate resin (Urethane Resins), silicone resin (Silicone Resins), reaches silicon dioxide (SiO ₂); More preferably be to select certainly in acryl resin, styrene resin, amido formate resin.The inventive method allows that also this population contains the particle of unlike material.

Help making in order to the shrinkability of the light collecting layer resin that forms this light collecting layer 5 protruding out between the two main microstructures 531, and/or the inferior microstructure 532 that convexedly stretches in the main microstructure 531 that is held forms; Preferably, the shrinkage factor of this light collecting layer resin is between 2%～10%, more preferably is between 4%～10%.

Light collecting layer resin used in the present invention can use treats polymerization single polymerization monomer, or through the polymer substance of polymerization; In addition based on above-mentioned shrinkage factor and with the demand of particle refractive index difference, and the use habit of cooperation this area, vibrin (PolyesterResins) is adopted in suggestion, polyacrylate resin (Polyacrylate Resins), polycarbonate resin (Polycarbonate Resins), halogenated styrenes (Halogenated Styrene), and various acrylic acid series transparent resin [epoxy diacrylate (EpoxyDiacrylate) for example, halogenation epoxy diacrylate (Halogenated EpoxyDiacrylate), methyl methacrylate (Methyl Methacrylate), isobornyl acrylate (Isobornyl Acrylate), 2-phenoxyethyl acrylate (2-PhenoxyEthyl Acrylate), acrylamide (Acrylamide), acrylic acid xenyl epoxy ethyl ester (Biphenylepoxyethyl Acrylate), halogenation acrylic acid xenyl epoxy ethyl ester (Halogenated Biphenylepoxyethyl Acrylate), alkoxide epoxy diacrylate (Alkoxylated Epoxy Diacrylate), alkyl halide oxidation epoxy diacrylate (Halogenated Alkoxylated Epoxy Diacrylate), fatty amine carbamate diacrylate (Aliphatic Urethane Diacrylate), fatty amine carbamate six acrylate (Aliphatic Urethane hexaacrylate), aromatic amine carbamate six acrylate (Aromatic Urethane hexaacrylate), bisphenol-A epoxy diacrylate (Bisphenol-A epoxy diacrylate), novolaks epoxy acrylate (Novolac Epoxy Acrylate), polyester acrylate (PolyesterAcrylate), polyester diacrylate (Polyester Diacrylate)] come as this light collecting layer resin; Wherein preferably be halogenation epoxy diacrylate, methyl methacrylate, 2-phenoxyethyl acrylate, fatty amine carbamate diacrylate, fatty amine carbamate six acrylate, aromatic amine carbamate six acrylate.Also allow various transparent resin mixed and use with as this light collecting layer resin.

The solid content of this light collecting layer resin solution is preferably 92wt%～100wt%, is more preferred from 95wt%～100wt% (solid content during for 100wt% be mean employed resin be to be in a liquid state); The wet-film thickness that this light collecting layer resin solution is coated with should more preferably be between 10 μ m～15 μ m between 10 μ m～25 μ m basically.

It is to handle by general plastotype molding mode that the curing plastotype that this light collecting layer resin solution is accepted is handled, for example impression (model as shown in embodiment), coating, spraying, transfer printing, ejaculation, then make its curing through the mode of for example irradiating ultraviolet light, to form this light collecting layer 5; It should be noted that this wet film can make formed condensing film thickness be higher than wet-film thickness because of distortion (for example being subjected to die marks) when this wet film accept to solidify plastotype and handles.

Preferably, the refractive index of this light collecting layer is between 1.4～1.7, be preferably again between 1.5～1.7, and more preferably be between 1.5～1.6.

Above-mentioned this diffusion layer resin solution and light collecting layer resin solution more can optionally and also include an adjuvant, and it is to select certainly in levelling agent, lubrication prescription, anti-staining agent, stabilization agent, antistatic agent, spreading agent, light initiator, crosslinking chemical, or their combination.

Below will the present invention each purpose embodiment and effect be described with each embodiment and comparative example.These embodiment and comparative example will use following chemicals and equipment to prepare or test, and if do not specify, then all be to carry out under the environment of normal temperature and pressure.It is noted that these embodiment are only with for illustrating, and should not be interpreted as restriction of the invention process.

Spent material and equipment

1.PET substrate: by the preparation of Japanese trader Toyobo company, model is A4300.

2. acroleic acid resin: by Kening Co.,Ltd's preparation, model is Photomer 4050.

3. isopropyl alcohol (IPA): prepare by Dalian chemical company.

4. particle (particle diameter is all between 0.1 μ m～100 μ m): refractive index is that 1.49--is combined by the Japanese trader and grinds company's preparation, and model is MR-10G; Refractive index is that 1.7 its models then are SUMITOMO AKS.

5. light initiator: by the preparation of permanent bridge company, model is KI-85.

6. diffusion layer coating machine: prepare by INOKIN company.

7. light collecting layer impressing mould: by helping the preparation of remy hair company, model is ALM-F1200.

Dependence test

1. mist degree (Hz) test and diffusibleness (Dfs) test: by the preparation of Japan electric look company, model is the haze meter of NDH2000, carries out the test specification of JIS K7105.

2. briliancy test: by the preparation of TOPCON company, model is the testing tool of BM-7 and is used the backlight that briliancy is 1500nits (by the preparation of Coretronic company, model is AT1962) and tests.

3. refraction index test: by the preparation of Japanese ATAGO company, model is that the refractometer of NAR-3T is tested.

4. ratio of gains test: calculate before and after this light collecting layer is provided with the enhancement number percent of the briliancy that is measured.

5. rainbow line assessment (anti-moire test): make the light source of a startup be arranged on substrate layer place near this blooming, whether this blooming of tester's Direct observation presents the rainbow line; If have, then expression by test, is not recorded as " X ", and expression is recorded as " O " by test if do not have then.

＜embodiment 1,2 〉

The embodiment the 1, the 2nd of the inventive method carries out according to each operation steps of aforementioned preparation method of the present invention, and make these through diffusion layer (or light collecting layer) resin solutions of coating under the gait of march of 30 (or 6) m/min, be that 185nm, unit of exposure areal intensity are that these solution of UV-irradiation of 15mW/cm2 solidify its contained resin with the wavelength.

The operations condition is then as shown in following table one.The blooming of the present invention that this two embodiment is made respectively, its section are then as shown in Figure 2.

＜comparative example 1～4 〉

The modus operandi of comparative example 1～4 is to be similar to aforementioned preparation method of the present invention, the difference place of these comparative examples and embodiment 1,2, mainly be the refractive index (comparative example 1,3) that is its employed particle, and the coating weight of light collecting layer resin solution (comparative example 2,4), as shown in table one; In addition, the sectional view of the blooming of comparative example 1,3 as shown in Figure 2, comparative example 2,4 is then as shown in Figure 9.

Table one

Referring to table one, there is bigger difference " weight ratio of particle and resin " aspect of embodiment 1,2, so can both make complex optical film of the present invention, and both cut-open views roughly as shown in Figure 2; Each particle among the embodiment 1 is comparatively to disperse, right embodiment 2 is because of using more particle, and making has the phenomenon of piling up between the particle, and the pass through path of light in embodiment 2 must be long than embodiment 1, therefore the briliancy of embodiment 1 is relatively higher, also has the higher ratio of gains.

It seems that with comparative example 1 both cut-open views so based on employed separately particle refractive index such as its grade, make embodiment 1 have 82.53% the ratio of gains, and are better than 72.48% of comparative example 1 all as shown in Figure 2 with regard to embodiment 1; Same situation also occurs in embodiment 2 and comparative example 3, and obvious in this case particle refractive index is for the extremely influential property of the performance of the briliancy and the ratio of gains.

In addition, comparative example 2,4 uses the particle identical with two embodiment, but used more light collecting layer resin solution coating weight in the preparation, made that the light collecting layer of its grade is obviously thicker and do not have time microstructure and formed, to such an extent as to all light have all passed through secondary condensation before by exiting surface; It seems that with regard to the result embodiment 1,2 also is better than the comparative example 2,4 of its similar in TW 200815789 aspect the briliancy and the ratio of gains two, and aspect diffusibleness, embodiment 1,2 also significantly surpasses comparative example 2,4.

In addition, 1,3 of embodiment 1,2 and comparative examples make that because of the formation of this grade microstructure is arranged the systematicness of its light collecting layer geometric configuration is lower, thereby have improved the problem of rainbow line; Relatively comparative example 2,4 is high because of the systematicness of its light collecting layer geometric configuration, light by the time still caused presenting of rainbow line, to such an extent as to fail by the test.

Different preparation conditions according to this diffusion layer, can obtain to have the blooming of the present invention of different mist degrees relatively, and further by the setting of this light collecting layer, make that partly light allows blooming of the present invention present the briliancy of excellence through optically focused, other light through twice optically focused ground and see through this microstructure unit, also relatively reduced simultaneously the geometrical configuration systematicness of light collecting layer, made that the rainbow line is avoided forming based on the existence of this grade microstructure.

Comprehensively above-mentioned, the present invention is when can be widely at the various mist degree area requirements that many downstream manufacturers proposed, and prepares and obtains to have high briliancy, high diffusibleness, and do not have the blooming of rainbow line interference.

Claims (21)

1. a complex optical film comprises the substrate layer, the diffusion layer that pile up in regular turn, and with a light collecting layer, this diffusion layer includes one and comprises most particles and abut population in this substrate layer, and one fixes the diffusion layer resin of this population; This light collecting layer then includes a light collecting layer resin and is formed with an exiting surface and microstructure unit that its geometrical configuration can make light-ray condensing ground penetrate, and this microstructure unit also includes most main microstructures; It is characterized in that:

It is to take advantage of a situation to form in the periphery of this population that this diffusion layer is connected in the interface of this light collecting layer, and this diffusion layer also has most the lug bosses that coat at least one particles out of the ordinary; This microstructure unit then also includes most at least one lug bosses of coating out of the ordinary and takes advantage of a situation and protrudes out between the two adjacent main microstructures, and/or protrudes out the inferior microstructure of a main microstructure that is held; The refractive index of described particle is between 1.2～1.6 and less than the refractive index of light collecting layer.

2. complex optical film as claimed in claim 1 is characterized in that: the average height of described main microstructure is between 10 μ m～100 μ m.

3. complex optical film as claimed in claim 1 is characterized in that: the width of described main microstructure is between 8 μ m～200 μ m.

4. complex optical film as claimed in claim 1 is characterized in that: the horizontal mean distance between two adjacent main microstructures is between 10 μ m～300 μ m.

5. complex optical film as claimed in claim 1 is characterized in that: the average thickness of this diffusion layer is between 1 μ m～40 μ m.

6. complex optical film as claimed in claim 1 is characterized in that: the particle diameter of described particle is between 1 μ m～100 μ m.

7. complex optical film as claimed in claim 1 is characterized in that: the refractive index difference of described particle and light collecting layer is in 0.5.

8. complex optical film as claimed in claim 1 is characterized in that: the refractive index of this light collecting layer is between 1.4～1.7.

9. complex optical film as claimed in claim 1 is characterized in that: also include a wall that is arranged on this substrate layer with being in reverse to this diffusion layer.

10. the preparation method of a complex optical film as claimed in claim 1, it is characterized in that: with the particle of particle size range between 0.1 μ m～100 μ m, and its solid content is the diffusion layer resin solution between 20wt%～80wt%, between 0.1～6, mix with the weight ratio of resin at particle, and coat on this substrate layer and make its dry sclerosis with a wet-film thickness between 4 μ m～50 μ m, and formation has described lug boss and its roughness is the diffusion layer of this interface between between 1 μ m～8.0 μ m, then be to coat on this interface the back between the light collecting layer resin solution between 90wt%～100wt% with a wet-film thickness between 3 μ m～40 μ m to accept one and solidify plastotype and handle with a solid content, to obtain this light collecting layer; In addition, this light collecting layer resin is the shrinkage factor that has between 1%～10%.

11. the preparation method of complex optical film as claimed in claim 10 is characterized in that: the roughness of the interface of this diffusion layer is between 0.5 μ m～4.5 μ m.

12. the preparation method of complex optical film as claimed in claim 10 is characterized in that: the solid content of this diffusion layer resin solution is between 30%～75%.

13. the preparation method of complex optical film as claimed in claim 10 is characterized in that: the weight ratio of described particle and diffusion layer resin is between 0.5～5.

14. the preparation method of complex optical film as claimed in claim 10 is characterized in that: in order to the wet-film thickness that forms this diffusion layer is between 10 μ m～40 μ m.

15. the preparation method of complex optical film as claimed in claim 10 is characterized in that: the material of described particle is to select from acryl resin, styrene resin, amido formate resin, silicone resin, reaches silicon dioxide.

16. the preparation method of complex optical film as claimed in claim 10 is characterized in that: the shrinkage factor of this light collecting layer resin is between 2%～10%.

17. the preparation method of complex optical film as claimed in claim 10 is characterized in that: the solid content of this light collecting layer resin solution is between 92%～100%.

18. the preparation method of complex optical film as claimed in claim 10 is characterized in that: the wet-film thickness of this light collecting layer resin solution is between 10 μ m～25 μ m.

19. the preparation method of complex optical film as claimed in claim 10, it is characterized in that: this diffusion layer resin is to select certainly in acryl resin, polyamide, epoxy resin, fluoroplast, polyimide resin, polyurethane resin, alkyd resin, vibrin, or their combination.

20. the preparation method of complex optical film as claimed in claim 10 is characterized in that: the mist degree when this diffusion layer and substrate layer only are set is between 2%～95%.

21. the preparation method of complex optical film as claimed in claim 10, it is characterized in that: this diffusion layer resin solution and/or light collecting layer resin solution also include an adjuvant, it is to select from smooth dose, lubrication prescription, anti-staining agent, stabilization agent, antistatic agent, light initiator, spreading agent, or their combination.

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